code: def test_table_values_update(lut, skip_check_gc):
      lut.cmap = "Greens"
      lut.values[:, -1] = np.linspace(0, 255, lut.n_values)
      assert lut.values.max() == 255
      assert lut.values[:, 2].max() < 255
  
imports: import numpy
  import pytest
  import vtk
  import pyvista
  from pyvista import Color, LookupTable
label_desc: Use image node_id 21 for calling a global function with example usage: test_table_values_update(lut, skip_check_gc) without return types